水下大直径盾构隧道渗漏综合整治技术

Comprehensive Treatment Technology for the Leakage of Large Underwater Shield Tunnel

水下大直径盾构隧道本身具有多缝、多孔的特点,且因水下水压大,存在竖向曲线和横向曲线下穿水下,极易造成渗漏,成为运营后重大安全隐患产生的主要影响因素。针对水下大直径盾构隧道渗漏水,通过研究合适的设备、机具、材料及工法,采用加固的理念进行堵漏,对盾构结构壁后进行三次、四次补充回填灌浆,对存水空腔进行灌浆、充填密实,修复管片拼接缝的三元乙丙橡胶密封胶条系统以及管片裂纹、螺栓孔、注浆孔等渗漏缺陷,达到综合整治渗漏水的目的。

The large diameter underwater shield tunnel itself has the characteristics of multi seam and multi hole,and because of the large underwater water pressure,there are vertical curves and horizontal curves under the water,which are easy to cause leakage,and become the main influencing factor of major safety hazards after operation.Aiming at the leakage of underwater large-diameter shield tunnel,through the study of appropriate equipment,machinery,materials and construction methods,the concept of reinforcement is adopted to stop the leakage:three and four times of supplementary backfill grouting is carried out behind the shield structure wall;the water storage cavity is grouted and filled tightly;the EPDM sealant strip system of segment joint,segment crack,bolt hole and grouting hole are repaired;so as to achieve the purpose of comprehensive treatment of water leakage.